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Condensed Matter > Mesoscale and Nanoscale Physics

Title: Fundamental bound on topological gap

Authors: Yugo Onishi, Liang Fu
(Submitted on 31 May 2023 (v1), last revised 24 Oct 2023 (this version, v3))
Abstract: We provide a universal tight bound on the energy gap of topological insulators by exploring relationships between topology, quantum geometry, and optical absorption. Applications of our theory to infrared absorption near topological band inversion, magnetic circular dichorism in Chern insulators, and topological gap in moir\'e materials are demonstrated.
Comments: 1+10 pages, 1 figure
Subjects: Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Materials Science (cond-mat.mtrl-sci); Strongly Correlated Electrons (cond-mat.str-el)
Journal reference: Phys. Rev. X 14, 011052 (2024)
DOI: 10.1103/PhysRevX.14.011052
Cite as: arXiv:2306.00078 [cond-mat.mes-hall]
  (or arXiv:2306.00078v3 [cond-mat.mes-hall] for this version)

Submission history

From: Yugo Onishi [view email]
[v1] Wed, 31 May 2023 18:00:33 GMT (322kb)
[v2] Tue, 1 Aug 2023 04:03:07 GMT (318kb)
[v3] Tue, 24 Oct 2023 17:20:32 GMT (327kb)
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